Koran Lernen is an Android app created by Ömer Aslan, a teacher of Quran recitation at Goethe University who has also published the book "Elif-Be." The app is designed to complement the book and includes all the lessons from it. The app is supported by audio files, making it easier to learn the Quran. Upon purchasing the book, you get the Koran Lernen app for free.

The app covers nine lessons, including characters, vowels, Dschesm, Med-letter, the stretch mark, Schedde doubling characters, the article, the word "Allah," and reading breaks at word endings. It is a great tool for anyone who wants to learn how to read and recite the Quran properly. The app is available for free and is a great resource for those interested in learning the Quran.